Sort the balls.
Take your time.
Kolba is a calm ball sort puzzle for iPhone. Move balls between glass tubes until every colour has a tube of its own. One new puzzle every day, the same for everyone.
Download on the App StoreFree · iPhone · iOS 26 or later
How it plays
Move a group
Tap a tube, tap another. The balls of one colour on top move together.
One colour per tube
Sort until every tube holds a single colour. Hints nudge before they tell; undo goes back as far as you like.
Mind the jar
Some boards add a jar. It holds one group at a time, locks to the first colour you put in, and must be empty at the end.
Why it feels different
Balls that feel good to touch
Matte, weighty balls that lift, travel and settle, each with a small haptic. No gloss, no confetti.
One puzzle a day
A new daily puzzle at midnight, the same for everyone, easiest on Monday. No timer, no streak to lose.
300 chapters
Finish one and the next is a tap away, from three colours up to eight. Or free play at the size you choose.
Race a friend
Send a link and play the same board. No account needed on either side.
Made to be accessible
Colour-assist symbols, high contrast, reduced motion, VoiceOver, and a palette tuned for colour blindness. Ball palettes and backgrounds to suit your eyes.
Everywhere you look
A widget, a Control Center control and a Siri shortcut for today's puzzle. Optional Game Center and iCloud sync.
The shelf by the window
Six short pages from the world of Kolba: a glass blower, a windowsill, and a ball that appears every morning. Read the story
Nothing to give up
No ads. No purchases. No account. No tracking. Kolba works fully offline.
Nothing goes to us: iCloud sync goes to your own iCloud, Game Center only if you turn it on, and a race link only when you share it. Available in English, Turkish, Spanish, Portuguese, French, German, Hindi, Russian and Indonesian.
Questions
Is it free?
Yes. There are no purchases and no ads.
Does it need internet?
No. Kolba works fully offline. Only a race link, Game Center and iCloud sync use the network, and only if you use them.
Which devices?
iPhone with iOS 26 or later.
Something is wrong?
Write to us from the support page.